Door-check.



T. S. GRISELL.

DOOR CHECK.

APPLICATION FILED 00129, 1912.

1,070,799, Patented Aug. 19, 1913. v

Inventor Attorneys UNK THOMAS S. GRISELL, OF BURB OAK, KANSAS.

DOOR-CHECK.

To aZZ whom it may concern:

Be it known that I, Trioti'as S. GRISELL, a citizen of the UnitedStates, residing at Burr Oak, in the county of Jewell and State ofKansas, have invented a new and useful Door-Check, of which thefollowing is a specification.

This invention relates to door checks, its object being to provide asimple and com pact device of this character which can be appliedreadily to a door and which can be readily adjusted so as to increase orreduce the force exerted by the door upon the check.

'With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement or" parts and in the details of construction hereinafter described and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed, Without departing from the spirit of theinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings :-Figure 1 is a perspective view of the door check inposition, the door being shown partly open. Fig. 2 is a plan view of thestructure, the parts being positioned as shown in Fig. 1. Fig. 3 is anenlarged longitudinal section through the cylinder of the door check.Fig. 4c is a detail view showing a slightly modified form of bracket.

Referring to the figures by characters of reference A. designates aportion of a door frame and B designates a door. Secured to the top ofthe door frame are oppositely disposed angular brackets 1 connected byparallel guide rods 2, these rods being fixedly secured to the brackets.A cross head 3 is mounted to slide on the rods and interposed betweenthis cross head and one of the brackets is a spring I which bears at itsends against the cross head and bracket respectively. An angular bracket5 is secured to the upper portion of the door B near the hinged sidethereof, this bracket including an outwardly extending arm 6 providedwith a plurality of apertures 7. Any one of these apertures is designedto receive a pintle 8 extending downwardly from one end of a cylinder 9.This cylinder has a Specification of Letters Patent.

Application filed October 9, 1912.

Patented Aug. 19,1913.

Serial No. 724,871.

piston 10 mounted to reciprocate therein, and the rod 11 of the pistonis pivotally connected, as at 12, to the cross head 3. An air inlet tube13 extends from one end of the cylinder 9 and has a check valve 14:whereby outflow of air through the tube is prevented.

An air vent 15 is also formed at that end from which the tube 13projects and this vent is provided with a valve'16 whereby the escape ofair therethrough may be controlled readily. It is to be understood thatthe spring 4 is connected at its ends to the cross head 3 and theadjacent bracket 1 and thus exerts a constant pull upon the cross head3. As a result, the piston 10 is normally located in that end of thecylinder 9 nearest the tube 13. Then the door 13 is opened, arm 6 pullson pintle 8 and thus causes cylinder 9 to slide upon the piston 10, themovement of the piston being retarded by reason of the fact that spring4. is interposed in the path of the cross head 3. Said spring, however,is placed under compression during this operation and, as the cylindercontinues to move relative to the piston 10, air enters the tube 13 soas to fill the space back of the piston. As the door B is to be providedwith the usual spring hinges it will be apparent that, when the door isreleased, it will swing closed. During this movement of the door the arm6 will push against the pintle 8 and thus cause the cylinder 9 to movetoward the remote bracket 1. Spring 4 will promptly expand and shift thecross -head against said remote bracket 1 whereupon the said cross headwill be brought to a sudden stop and the air trapped between the piston10 and the valve end of the cylinder 9 will cushion the door immediatelyprior to reaching its closed position. This trapped air gradually leaksthrough the vent 15 and when the valved end of the cylinder is finallybrought close to the piston 10. the door comes to its closed position.It will be seen that by shifting the pintle 8 within the openings 7 theleverage exerted by the door B can be increased or diminished asdesired.

Instead of utilizing a bracket having a rigid arm, as shown in Figs. 1and 2, the arm of the bracket can be hingedly mounted, as shown at 18 inFig. 4 so that, when the door is opened, this arm will swing intoalinement with the cylinder. A spring 19 may be employed for holding thearm 18 normally at an angle to the side of the door.

l Vhat is claimed is l. A door check including guides, means forconnecting them to the top of a door frame, a slidable member on theguides, a spring for controlling the movement of said member, a pistonpivotally connected to the slidable member, a cylinder mounted to slideon the piston, said cylinder having a valved inlet an l. a valvedoutlet, and a spring controlled member pivotally connected to thecylinder and adapted to be attached to a door.

2. A door check including guides, means for connecting them to the topof a door "frame, a slidable member on the guides, a spring forcontrolling the movement of said member, a piston pivotally connected tothe slidable member, a cylinder mounted to slide on the piston, saidcylinder having a valved inlet and a valved outlet at one end,

and means for pivotally and adjustably connecting the cylinder to adoor.

3. A door check including guiding means adapted to be connected to adoor frame, a slidable member on said guiding means, a spring forcontrolling the movement of the slidable member, a piston pivotallyconnected to the slidable member, a cylinder mounted to slide on thepiston and having a valved inlet and a valved outlet, an arm adapted tobe connected to :1 door, said arm having a plurality of openingstherein, and a pintle depending from the cylinder and adapted to beseated in any one of the open ings.

In testimony that I claim the foregoing as my own, I have hereto atlxedmy signa ture in the presence of two witnesses.

THOR AS S GRESELL.

lVitnesses F. S. TUCKER, C. E. HALLBERG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). G.

